Server/internal/gentools/slices.go

package gentools

func IndexOf[T comparable](arr []T, value T) int {
	for i, v := range arr {
		if v == value {
			return i
		}
	}

	return -1
}

func AddUniques[T comparable](arr *[]T, values ...T) {
Outer:
	for _, v := range values {
		for _, v2 := range *arr {
			if v2 == v {
				continue Outer
			}
		}

		*arr = append(*arr, v)
	}
}

func Map[T any, U any](arr []T, cb func(T) U) []U {
	arr2 := make([]U, len(arr))
	for i, v := range arr {
		arr2[i] = cb(v)
	}

	return arr2
}

func Flatten[T any](arr [][]T) []T {
	arr2 := make([]T, 0, 128)
	for _, sub := range arr {
		arr2 = sub
	}

	return arr2
}